| ??? 04/19/06 13:14 Read: times |
#114521 - handshake? Responding to: ???'s previous message |
But, Stevan, you need no extra pin on the processor for the "Auto" option, it's still just Rx and Tx (and, of course, /PSEN and RESET)! The "extra" signals come from the PC's COM port... please have a look on the diagram in the appnote once more.
Btw. Erik's NoTouch is a good idea; you simply implement some triggering mechanism to start ISP from you user program (e.g. the user prrogram tests for receiving "ISP" string, and if it occurs, it sets the bit needed for bootloader memory to be active and jumps to the bootloader start address). However, you still might need an emergency solution and also for the "first time" programming, a simple momentary switch (pushbutton) from /PSEN to ground will do. Jan Waclawek |
| Topic | Author | Date |
| AT89C51ED2 ISP Hardware configuration | 01/01/70 00:00 | |
| from the source | 01/01/70 00:00 | |
| I will try it. | 01/01/70 00:00 | |
| because it would make datasheets books | 01/01/70 00:00 | |
| family documents | 01/01/70 00:00 | |
| Philips is good in this respect | 01/01/70 00:00 | |
| it's not philips | 01/01/70 00:00 | |
| ISP circuit | 01/01/70 00:00 | |
| Manual ISP | 01/01/70 00:00 | |
| use NoTouch | 01/01/70 00:00 | |
| handshake? | 01/01/70 00:00 | |
| yes'es and no's | 01/01/70 00:00 | |
| nos and yes's | 01/01/70 00:00 | |
| location dependent | 01/01/70 00:00 | |
| unlikely? | 01/01/70 00:00 | |
make a .bat file | 01/01/70 00:00 |